Roof Preparation - Dometic Duo-Therm 57915.331 Installation Instructions Manual

FIG. 4
7-5/8"
5-1/4"
7-5/8"
14-1/4 x 14-1/4 (±1/8") Opening
1-1/2"
F
17"
r
o
1-1/4"
n
t
1-1/2"
17"
Air Grill Perimeter
C. Roof Preparation
1. Opening Requirements - Before preparing the ceil-
ing opening, the type of system options must be
decided upon. If a furnace is to be connected, wires
must be run from the furnace to the Dometic A/C.
Read all of the following instructions before begin-
ning the installation.
If a roof vent opening will not be used a 14-1/4" x 14-
1/4" (±1/8") opening must be cut through the roof and
ceiling of the RV. This opening must be located
between the roof reinforcing members.
There may be electrical wiring between the
roof and the ceiling. Disconnect 115 volt AC
power cord and the positive (+) 12 volt DC ter-
minal at the supply battery. Failure to follow
this instruction may create a shock hazard
causing death or severe personal injury.
The 14-1/4" x 14-1/4" (±1/8") opening is part of the
return air system of the Air Conditioner and must be
finished in accordance with NFPA Standard 501C
Section 2.7.2.
2. Roof Vent Removal
a. Unscrew and remove the roof vent.
b. Remove all caulking compound around open-
ing.
c. Seal all screw holes and seams where the roof
gasket is located. Use a good grade of all
weather sealant. See FIG. 5.
Rear
of
14-7/8"
Unit
18"
2"
1-3/4"
3"
3"
2"
20-7/8"
Genesis
FIG. 5
d. If the opening exceeds 14-3/8" x 14-3/8", it will
e. If the opening is less than 14-1/8" x 14-1/8", it
18-1/2"
3. New Opening- (Installation Other Than Vent Open-
ing)
a. Mark a 14-1/4" x 14-1/4" (±1/8") square on the
b. Using the roof opening as a guide, cut the
c. The opening created must be framed to provide
FIG. 6
Do Not Cut
Roof Structure
Or Rafters
3/4" Min.
Leave Access For Power
Supply Wiring
It is the responsibility of the installer of this
air conditioner system to ensure structural
integrity of the RV roof. Never create a low
spot on the roof where water will collect. Wa-
ter standing around the air conditioner may
leak into the interior causing damage to the
product and the RV.
5
579 & 595 Installation Instructions
be necessary to install spacers.
must be enlarged.
roof and carefully cut the opening.
matching hole in the ceiling.
adequate support and prevent air from being
drawn from the roof cavity. Lumber 3/4" or more
in thickness must be used. Remember to pro-
vide an entrance hole for power supplies, fur-
nace wiring, and 4-conductior receiver cable.
Good-Rafters
Supported By
Cross Beams
Frame Opening So It
Won't Collapse When
Bolting Down Unit
Good Location-
Between Roof
Rafters
15" Min. At
Front Of
Opening